<template>
    <div>
        <!-- 面包屑导航区 -->
        <el-breadcrumb separator="/">
        <el-breadcrumb-item :to="{ path: '/' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item>
        <el-breadcrumb-item>参数列表</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片视图 -->
        <el-card>
            <!-- 警告区域 -->
            <el-alert show-icon title="注意：只允许为第三级分类设置相关参数！" 
            type="warning" :closable="false"></el-alert>

            <!-- 选择商品分类区域 -->
            <el-row class="cat_opt">
                <el-col>
                <span>选择商品分类：</span>
                <!-- 选择商品分类的级联选择框 -->
                <el-cascader expand-trigger="hover" :options="catelist" :props="cateProps" v-model="selectedCateKeys" @change="handleChange">
                </el-cascader>
                </el-col>
            </el-row>

            <!-- tab 页签区域 -->
            <el-tabs v-model="activeName" @tab-click="handleTabClick">
                <!-- 添加动态参数的面板 -->
                <el-tab-pane label="动态参数" name="many">
                <!-- 添加参数的按钮 -->
                <el-button type="primary" size="mini" :disabled="isBtnDisabled" 
                    @click="addDialogVisible=true">添加参数</el-button>
                <!-- 动态参数表格 -->
                <el-table :data="manyTableData" border stripe>
                    <!-- 展开行 -->
                    <el-table-column type="expand">
                        <template slot-scope="scope">
                            <!-- 循环渲染tag标签 -->
                            <el-tag v-for="(item,i) in scope.row.attr_vals"
                             :key="i" closable @close="handleClose(i,scope.row)">
                            {{item}}</el-tag>
                            <!-- 输入文本框 -->
                            <el-input
                            class="input-new-tag"
                            v-if="scope.row.inputVisible"
                            v-model="scope.row.inputValue"
                            ref="saveTagInput"
                            size="small"
                            @keyup.enter.native="handleInputConfirm(scope.row)"
                            @blur="handleInputConfirm(scope.row)"
                            >
                            </el-input>
                            <!-- 添加按钮 -->
                            <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>

                        </template>
                    </el-table-column>
                    <!-- 索引列 -->
                    <el-table-column type="index"></el-table-column>
                    <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                    <el-table-column label="操作">
                    <template slot-scope="scope">
                        <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                        <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
                    </template>
                    </el-table-column>
                </el-table>
                </el-tab-pane>

                <!-- 添加静态属性的面板 -->
                <el-tab-pane label="静态属性" name="only">
                <!-- 添加属性的按钮 -->
                <el-button type="primary" size="mini" :disabled="isBtnDisabled" 
                @click="addDialogVisible=true">添加属性</el-button>
                <!-- 静态属性表格 -->
                <el-table :data="onlyTableData" border stripe>
                    <!-- 展开行 -->
                    <el-table-column type="expand">
                        <template slot-scope="scope">
                            <!-- 循环渲染tag标签 -->
                            <el-tag v-for="(item,i) in scope.row.attr_vals"
                             :key="i" closable @close="handleClose(i,scope.row)">
                            {{item}}</el-tag>
                            <!-- 输入文本框 -->
                            <el-input
                            class="input-new-tag"
                            v-if="scope.row.inputVisible"
                            v-model="scope.row.inputValue"
                            ref="saveTagInput"
                            size="small"
                            @keyup.enter.native="handleInputConfirm(scope.row)"
                            @blur="handleInputConfirm(scope.row)">
                            </el-input>
                            <!-- 添加按钮 -->
                            <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                        </template>
                    </el-table-column>
                    <!-- 索引列 -->
                    <el-table-column type="index"></el-table-column>
                    <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                    <el-table-column label="操作">
                    <template slot-scope="scope">
                        <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                        <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
                    </template>
                    </el-table-column>
                </el-table>
                </el-tab-pane>
            </el-tabs>
        </el-card>

        <!-- 添加参数的对话框 -->
        <el-dialog :title="'添加' + titleText" :visible.sync="addDialogVisible" width="50%" @close="addDialogClosed">
          <!-- 添加参数的对话框 -->
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
                <el-form-item :label="titleText" prop="attr_name">
                <el-input v-model="addForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="addDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="addParams">确 定</el-button>
            </span>
        </el-dialog>

        <!-- 修改参数的对话框 -->
        <el-dialog :title="'修改' + titleText" :visible.sync="editDialogVisible" width="50%" @close="editDialogClosed">
            <!-- 添加参数的对话框 -->
            <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
                <el-form-item :label="titleText" prop="attr_name">
                <el-input v-model="editForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="editDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="editParams">确 定</el-button>
            </span>
        </el-dialog>


        </div>
</template>
<script>
 export default {
    data() {
        return {
            //商品分类
            catelist:[],
            //级联选择框的配置对象
            cateProps:{
                value:'cat_id',
                label:'cat_name',
                children:'children'
            },
            //级联选择框双向绑定
            selectedCateKeys:[],
            //被激活的页签的名称
            activeName:'many',
            //动态(静态)参数的数据
            manyTableData:[],
            onlyTableData:[],
            //控制添加对话框的显示与隐藏
            addDialogVisible:false,
            // 添加参数的表单数据对象
            addForm: {
                attr_name: ''
            },
            // 添加表单的验证规则对象
            addFormRules: {
                attr_name: [
                { required: true, message: '请输入参数名称', trigger: 'blur' }
                ]
            },
            //修改
            editDialogVisible:false,
            editForm:{},
            editFormRules:{
                attr_name: [
                { required: true, message: '请输入参数名称', trigger: 'blur' }
                ]
            },


            
        }
    },
    created(){
        this.getCateList()
    },
    methods:{
        async getCateList(){
            const {data:res}=await this.$http.get('categories')
            console.log(res);
            if(res.meta.status!=200){
                return this.$message.error(res.meta.msg)
            }
            this.catelist=res.data
            console.log(this.catelist);
        },
        //级联选择框选中项变化，会触发这个函数
        handleChange(){
            this.getParamsData()
        },
        //tab页签点击事件的处理函数
        handleTabClick(){
            this.getParamsData()
            console.log(this.activeName);
        },
        //获取参数的
        async getParamsData(){
            //证明选中的不是三级分类
            if(this.selectedCateKeys.length!=3){
                this.selectedCateKeys=[]
                this.manyTableData=[]
                this.onlyTableData=[]
                return
            }
            //证明选中的是三级分类
            //根据所选分类的id，和当前所处的面板，获取对应的参数
            const {data:res} =await this.$http.get(`categories/${this.cateId}/attributes`,{
                params:{sel:this.activeName}})
            if(res.meta.status!=200){
                this.$message.error('获取参数列表失败')
            }
            res.data.forEach(item=>{
                item.attr_vals=item.attr_vals ?
                item.attr_vals.split(' '):[]
                //控制文本框的显示与隐藏
                item.inputVisible=false
                item.inputValue=''
            })
            console.log(res.data)

            if(this.activeName=='many'){
                this.manyTableData=res.data
            }else{
                this.onlyTableData=res.data
            }
        },
        //监听添加对话框的关闭事件
        addDialogClosed(){
            this.$refs.addFormRef.resetFields()
        },
        //点击按钮，添加参数
        addParams(){
            this.$refs.addFormRef.validate(async valid=>{
                if(!valid) return
                const {data:res}= await this.$http.post(`categories/${this.cateId}/attributes?attr_name=${this.addForm.attr_name}&&attr_sel=${this.activeName}`,
                )
                if(res.meta.status!=201){
                    return this.$$message.error("添加参数错误")
                }
                this.$message.success('添加参数成功')
                this.addDialogVisible=false
                this.getParamsData()
            })
        },
        //点击按钮，展示修改对话框
        async showEditDialog(attr_id){
            const {data:res}=await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`
            ,{params:{attr_sel:this.activeName}})
            if(res.meta.status!=200){
                this.$message.error('查询参数失败')
            }
            this.editForm=res.data
            this.editDialogVisible=true
        },
        editDialogClosed(){
            this.$refs.editFormRef.resetFields()
        },
        editParams(){
            this.$refs.editFormRef.validate(async valid=>{
                if(!valid) return
                const {data:res}= await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,{
                    attr_name:this.editForm.attr_name,
                    attr_sel:this.activeName

                })
                if(res.meta.status!=200){
                    return this.$message.error('编辑参数失败')
                }
                this.$message.success('修改参数成功')
                this.getParamsData()
                this.editDialogVisible=false
            })
        },
        async removeParams(attr_id){
            const confirmResult = await this.$confirm(
                '此操作将永久删除该参数, 是否继续?',
                '提示',
                {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
                }
            ).catch(err => err)

            // 用户取消了删除的操作
            if (confirmResult !== 'confirm') {
                return this.$message.info('已取消删除！')
            }
            const {data:res}=await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
            if(res.meta.status!=200){
                return this.$message.error('删除参数失败！')
            }
            this.$message.success('删除成功')
            this.getParamsData()
        },
        //文本框失去焦点
        handleInputConfirm(row){
            if(row.inputValue.trim().length==0){
                row.inputValue=''
                row.inputVisible=false
                return 
            }
            row.attr_vals.push(row.inputValue.trim())
            row.inputValue=''
            row.inputVisible=false
            this.saveAttrVals(row)
            
        },
        async saveAttrVals(row){
            //请求
            const {data:res}= await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,
                    { attr_name:row.attr_name,
                    attr_sel:row.attr_sel,
                    attr_vals:row.attr_vals.join(' ')
                    })
            console.log(res.data)
            if(res.meta.status!=200){
                return this.$message.error('更新失败！')
            }
            this.$message.success('更新成功！')

        },
        //点击按钮展示文本输入框
        showInput(row){
            row.inputVisible=true
            this.$nextTick(_ => {
            this.$refs.saveTagInput.$refs.input.focus();
            });
        },
        //删除对应参数可选项
        handleClose(i,row){
            row.attr_vals.splice(i,1)
            this.saveAttrVals(row)
        }


    },
    computed:{
    // 如果按钮需要被禁用，则返回true，否则返回false
    isBtnDisabled() {
      if (this.selectedCateKeys.length !== 3) {
        return true
      }
      return false
    },
    // 当前选中的三级分类的Id
    cateId() {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2]
      }
      return null
    },
    // 动态计算标题的文本
    titleText() {
      if (this.activeName === 'many') {
        return '动态参数'
      }
      return '静态属性'
    }
  }
    
 }
</script>

<style lang="less" scoped>
.cat_opt{
    margin: 15px 0;
}
.el-tag{
    margin: 10px;
}
.input-new-tag {
  width: 120px;
}
</style>